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A Greek physician named, Erasistratus, discovered that his patients' heart rate would increase when they lied.
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Along time ago, a murder was committed with a sickle. The people in the village who owned a sickle had to take them outside and lay them in the sun. They would watch for flies to see which one the flies were most attracted to.
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A man named, Bartolomeo da Varignana, was the first to person to perform an autopsy on a suspected murder of a nobleman.
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The first microscope is developed.
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Henry Goddard of Scotland was the first person to compare bullets in a murder investigation. The comparison was based in a visible flaw in the bullet, traced back to a mold.
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The first use of photography in crimes was used. It was used for identification of criminals, documentation of evidence, and crime scenes.
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Probably the most famous way is fingerprints. A Scottish man named, Henry Faulds, wrote a paper about how fingerprints can identify the offender.
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John Larson and Leonard Keeler design the portable polygraph.
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FBI crime laboratory is created.
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Teeth comparisons are first used from corpses.
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R.F. Borkenstein invents the Breathalyzer test for soberiety testing.
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De Saram writes measurements of temperature obtained from executed prisoners. They can tell about how long someone has been dead for based on the temperature.
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The Forensic Science Service starts using footprints and shoe prints as ways to find the offender.